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Restructuring - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017
Restructuring Cost And Reserve [Line Items] |  |  |  |
Percentage of reduction in global workforce | 40.00% |  |  |
Restructuring |  |  | $ 2,783 |
Employee Severance and Other Benefits |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring |  | $ 2,800 |  |
Cash payments |  |  |  | $ 2,800

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